Drill-chuck.



No. 841,758 PATBNTEDJAN. 22, 1907.

W. H. ADAMS.

DRILL CHUCK.

APPLICATION FILED AUG. 6. 190 6.

WITNESSES 8 /NVENTOH;

' I J-I. Raina! WVW ' ATTORNEY THE NORRIS PETERS (20., WASHINGTON, D- c.

WALTER H. ADAMS, OF SOUND BEACH. CONNECTICUT.

. DRILL-CHUCK.

Specification of Letters Patent.

Patented Jan. 22, 1907'.

Application filed August 6,1906. Serial No, 329,472

To all whmn it may concern:

Be it known that I, WALTER H. ADAMS, a citizen of the United States, residing at Sound Beach, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Drill- Chucks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to drill-chucks; and it consists in the novel arrangement of parts and combinations of parts, such as will be hereinafter fully set forth and then particularly pointed out in the claims which conclude this application. In the accompanying drawings, Figure 1 is a sectional elevation of my improved chuck with the jaws distended Fig. 2, a similar view with the jaws closed; Fig. 3, a detail plan view of the body of the chuck, and Fig. 4 a detail plan of one of the jaws.

Similarnumbers of reference denote like parts in the several figures of the drawings.

The object of my improvement is to insure a biting contact throughout the length of the jaw-heads whether the drill-shank be straight or tapered, while atthe same time the jaws themselves shall be under a spring tension at all times.

1 is the body of the chuck, which has two deep channels 2 out therein at the top and bottom and extending from the rear portion of the body to a point near the front end thereof, so as to leave a solid web portion 3 extending throughout said body. 4' 5 are circular openings or perforations extending through this web at the front and rear portions thereof, and 6 7 are coil-springs loosely assembled within these perforations.

8 9 are the aw-heads, from which extend tails 10 11, the extremities of which latter are provided with hooks 12 13, which are engaged with the opposite ends of the coilspring 6, the resilient energy of which latter always tends to draw these hooked ends toward each other. The forward portions of these tails near the point where they join the jaw-heads are normally in contact with the spring 7, the resilient energy of which latter always tends to spread the jaws apart' The junction of the tails with the heads of the jaws forms shoulders 14, which are normally immediately in front of that portion of the chuck-body at the forward ends of the channels, so that it will be clear that these jaws cannot accidentally slip backward.

The circumference of the chuck-body is threaded throughout the greater portion of its length, as seen at 15,-while the forward portion of the body is cone-shaped, as seen at 16.

l7 is an interiorly-threaded sleeve which surrounds the chuck-body and engages the threads thereon, the forward portion of this sleeve being likewise cone-shaped, as seen at 18.

The operation of my improvement is as follows: When the jaws are fully relaxed, the position of the parts is as is shown. at Fig. 1, the rear ends of the tail portions being drawn to- 'gether by the action of the spring 6, while the front ends of the tail portions are forced apart by the action of the spring 7. When a drill-shank is placed between the jaw-heads and the sleeve is run backward, the conical end of the sleeve will strike against the outer surfaces of the jaw-heads, which latter are beveled to correspond with said conical end, and will thereby force the jaw-heads against said shank, this'being accomplished against the resiliency of both of the springs 6 7, the consequence being that said jaw-heads will be steadied in their action and will come into firm contact with said shank. 7

It is immaterial whether the shank is straight or beveled, since the jaws have no lost motion whatever and are always under spring tension and, furthermore, because the closing action ofthe jaws is resisted by both the springs 6 7.

I claim 1. In a drill-chuck, the combination of the exteriorly-threaded body having upper and lower channels, whereby a central web is formed which latter has perforations extending therethrough at the rear and front ends thereof, the coilsprings within said perforations, the jaws within said channels and comprising head and tail portions the free ends of the tail portions being hooked within the opposite ends of 'the rear coil-springs which latter have'a resilient energy which tends to draw together the extreme ends of said tail portions, while the front portions of these tails are always in contact with the front coil-springs which latter have a resilient energy that tends to spread the jaws apart, the head portions having 'a shoulder engagement with the chuck-body, and the interiorly-threaded sleeve having a conical Ioo front end and adapted to be driven on said bod 2. In a drill-chuck, the combination of the eXteriorly-threaded body lower channels out therein whereby a central web is formed which latter has perforations extending therethrough at the rear and front ends thereof, the forward part of said body terminating in a reduced oone-shaped portion, the coil-springs within said perform tions the rear spring having a contractile energy while the front spring has an expansive energy, the jawswithin said channels and comprising beveled head portions eonfined by the chuck-body as against bankhaving upper and l ward movement and rearwardly-extending tail portions, the free ends of the tail por tions being engaged with the opposite ends of the rear coil-springs beyond the web while the front portions of these tails are al 1 ways in contact with the forward springs,

and the interiorly-threaded conical -nosed sleeve capable of being driven on said body against said jaws.

In testimony whereof I alliX my signature in presence of two witnesses.

' WVALTER H. ADAMS.

itnesses F. W. SMITH, Jr., M. 'I. LONGDEN. 

